To remove the blades - be sure the on/off switch is in the "O" (OFF) position. Hold the clipper firmly in one hand. Using the thumb of your other hand, simply push the blades away from the front of the clipper. The blades and mounting plate behind them will all come off in one piece.
To remove hair from between the blades, use the cleaning brush provided. Be sure to use Wahl Clipper Oil between the blades before each use. Before replacing the blades, be sure the top blades move freely. To reattach the blade, place the hook at the bottom of the blade set into the space provided on the clipper housing. Then pivot the blade set toward the housing. Once it is seated, snap blade set to case so that you hear a click.